C.A.S.S. Certification is the process of comparing every address in your database to that of a database of all deliverable address from the USPS.
The C.A.S.S. list management step ensures that the addresses for your mailing are valid, so pieces get delivered as per your expectations.
The C.A.S.S. Certification process standardizes and appends specific information to records governed by the USPS.
The automation classes insure 2 things: 1) You will pay the lowest cost for your postage.
2) It will be delivered in the quickest timeframe as compared to non-automated mailings.
Existing and non-existing addresses are confirmed down to the specific address; Delivery Point Verification (DPV), part of C.A.S.S., is also available if validation to the physical address (including suite or unit numbers) is required